Just to back up the above two reviews. I discovered the series by accident, just in time to miss episode one... It is well-written, well-casted, well-acted and 'well' just about everything else. It is tense, gripping and almost visceral. You can feel the tension, hell, you can almost SMELL it.
The main plot rattles along, all the while accompanied by several sub-plots, vested interests and twists and turns involving different cast members at different times.
Basically, this is Great!